From a3199ad90ac33c1afae0fa3dbf2e0fe4ee827fa7 Mon Sep 17 00:00:00 2001 From: Jesper Nilsson Date: Mon, 27 Oct 2014 09:11:31 +0100 Subject: [PATCH] CRISv32: ETRAXFS: Fix recursive spinlock Move pinmux alloc/dealloc code into functions that don't take the spinlock so we can use from code that has the spinlock already. CRISv32 has no working SMP, so spinlocks becomes a NOP, so deadlock was never seen. Signed-off-by: Jesper Nilsson --- arch/cris/arch-v32/mach-fs/pinmux.c | 152 ++++++++++-------- .../include/arch-v32/mach-fs/mach/pinmux.h | 2 - 2 files changed, 83 insertions(+), 71 deletions(-) diff --git a/arch/cris/arch-v32/mach-fs/pinmux.c b/arch/cris/arch-v32/mach-fs/pinmux.c index 38f29eec14a6..05a04708b8eb 100644 --- a/arch/cris/arch-v32/mach-fs/pinmux.c +++ b/arch/cris/arch-v32/mach-fs/pinmux.c @@ -26,7 +26,29 @@ static DEFINE_SPINLOCK(pinmux_lock); static void crisv32_pinmux_set(int port); -int crisv32_pinmux_init(void) +static int __crisv32_pinmux_alloc(int port, int first_pin, int last_pin, + enum pin_mode mode) +{ + int i; + + for (i = first_pin; i <= last_pin; i++) { + if ((pins[port][i] != pinmux_none) + && (pins[port][i] != pinmux_gpio) + && (pins[port][i] != mode)) { +#ifdef DEBUG + panic("Pinmux alloc failed!\n"); +#endif + return -EPERM; + } + } + + for (i = first_pin; i <= last_pin; i++) + pins[port][i] = mode; + + crisv32_pinmux_set(port); +} + +static int crisv32_pinmux_init(void) { static int initialized; @@ -37,20 +59,20 @@ int crisv32_pinmux_init(void) pa.pa0 = pa.pa1 = pa.pa2 = pa.pa3 = pa.pa4 = pa.pa5 = pa.pa6 = pa.pa7 = regk_pinmux_yes; REG_WR(pinmux, regi_pinmux, rw_pa, pa); - crisv32_pinmux_alloc(PORT_B, 0, PORT_PINS - 1, pinmux_gpio); - crisv32_pinmux_alloc(PORT_C, 0, PORT_PINS - 1, pinmux_gpio); - crisv32_pinmux_alloc(PORT_D, 0, PORT_PINS - 1, pinmux_gpio); - crisv32_pinmux_alloc(PORT_E, 0, PORT_PINS - 1, pinmux_gpio); + __crisv32_pinmux_alloc(PORT_B, 0, PORT_PINS - 1, pinmux_gpio); + __crisv32_pinmux_alloc(PORT_C, 0, PORT_PINS - 1, pinmux_gpio); + __crisv32_pinmux_alloc(PORT_D, 0, PORT_PINS - 1, pinmux_gpio); + __crisv32_pinmux_alloc(PORT_E, 0, PORT_PINS - 1, pinmux_gpio); } return 0; } -int -crisv32_pinmux_alloc(int port, int first_pin, int last_pin, enum pin_mode mode) +int crisv32_pinmux_alloc(int port, int first_pin, int last_pin, + enum pin_mode mode) { - int i; unsigned long flags; + int ret; crisv32_pinmux_init(); @@ -59,26 +81,11 @@ crisv32_pinmux_alloc(int port, int first_pin, int last_pin, enum pin_mode mode) spin_lock_irqsave(&pinmux_lock, flags); - for (i = first_pin; i <= last_pin; i++) { - if ((pins[port][i] != pinmux_none) - && (pins[port][i] != pinmux_gpio) - && (pins[port][i] != mode)) { - spin_unlock_irqrestore(&pinmux_lock, flags); -#ifdef DEBUG - panic("Pinmux alloc failed!\n"); -#endif - return -EPERM; - } - } - - for (i = first_pin; i <= last_pin; i++) - pins[port][i] = mode; - - crisv32_pinmux_set(port); + ret = __crisv32_pinmux_alloc(port, first_pin, last_pin, mode); spin_unlock_irqrestore(&pinmux_lock, flags); - return 0; + return ret; } int crisv32_pinmux_alloc_fixed(enum fixed_function function) @@ -98,58 +105,58 @@ int crisv32_pinmux_alloc_fixed(enum fixed_function function) switch (function) { case pinmux_ser1: - ret = crisv32_pinmux_alloc(PORT_C, 4, 7, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_C, 4, 7, pinmux_fixed); hwprot.ser1 = regk_pinmux_yes; break; case pinmux_ser2: - ret = crisv32_pinmux_alloc(PORT_C, 8, 11, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_C, 8, 11, pinmux_fixed); hwprot.ser2 = regk_pinmux_yes; break; case pinmux_ser3: - ret = crisv32_pinmux_alloc(PORT_C, 12, 15, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_C, 12, 15, pinmux_fixed); hwprot.ser3 = regk_pinmux_yes; break; case pinmux_sser0: - ret = crisv32_pinmux_alloc(PORT_C, 0, 3, pinmux_fixed); - ret |= crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_C, 0, 3, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed); hwprot.sser0 = regk_pinmux_yes; break; case pinmux_sser1: - ret = crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed); hwprot.sser1 = regk_pinmux_yes; break; case pinmux_ata0: - ret = crisv32_pinmux_alloc(PORT_D, 5, 7, pinmux_fixed); - ret |= crisv32_pinmux_alloc(PORT_D, 15, 17, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_D, 5, 7, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_D, 15, 17, pinmux_fixed); hwprot.ata0 = regk_pinmux_yes; break; case pinmux_ata1: - ret = crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed); - ret |= crisv32_pinmux_alloc(PORT_E, 17, 17, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_D, 0, 4, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_E, 17, 17, pinmux_fixed); hwprot.ata1 = regk_pinmux_yes; break; case pinmux_ata2: - ret = crisv32_pinmux_alloc(PORT_C, 11, 15, pinmux_fixed); - ret |= crisv32_pinmux_alloc(PORT_E, 3, 3, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_C, 11, 15, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_E, 3, 3, pinmux_fixed); hwprot.ata2 = regk_pinmux_yes; break; case pinmux_ata3: - ret = crisv32_pinmux_alloc(PORT_C, 8, 10, pinmux_fixed); - ret |= crisv32_pinmux_alloc(PORT_C, 0, 2, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_C, 8, 10, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_C, 0, 2, pinmux_fixed); hwprot.ata2 = regk_pinmux_yes; break; case pinmux_ata: - ret = crisv32_pinmux_alloc(PORT_B, 0, 15, pinmux_fixed); - ret |= crisv32_pinmux_alloc(PORT_D, 8, 15, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_B, 0, 15, pinmux_fixed); + ret |= __crisv32_pinmux_alloc(PORT_D, 8, 15, pinmux_fixed); hwprot.ata = regk_pinmux_yes; break; case pinmux_eth1: - ret = crisv32_pinmux_alloc(PORT_E, 0, 17, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_E, 0, 17, pinmux_fixed); hwprot.eth1 = regk_pinmux_yes; hwprot.eth1_mgm = regk_pinmux_yes; break; case pinmux_timer: - ret = crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed); + ret = __crisv32_pinmux_alloc(PORT_C, 16, 16, pinmux_fixed); hwprot.timer = regk_pinmux_yes; spin_unlock_irqrestore(&pinmux_lock, flags); return ret; @@ -188,9 +195,19 @@ void crisv32_pinmux_set(int port) #endif } -int crisv32_pinmux_dealloc(int port, int first_pin, int last_pin) +static int __crisv32_pinmux_dealloc(int port, int first_pin, int last_pin) { int i; + + for (i = first_pin; i <= last_pin; i++) + pins[port][i] = pinmux_none; + + crisv32_pinmux_set(port); + return 0; +} + +int crisv32_pinmux_dealloc(int port, int first_pin, int last_pin) +{ unsigned long flags; crisv32_pinmux_init(); @@ -199,11 +216,7 @@ int crisv32_pinmux_dealloc(int port, int first_pin, int last_pin) return -EINVAL; spin_lock_irqsave(&pinmux_lock, flags); - - for (i = first_pin; i <= last_pin; i++) - pins[port][i] = pinmux_none; - - crisv32_pinmux_set(port); + __crisv32_pinmux_dealloc(port, first_pin, last_pin); spin_unlock_irqrestore(&pinmux_lock, flags); return 0; @@ -226,58 +239,58 @@ int crisv32_pinmux_dealloc_fixed(enum fixed_function function) switch (function) { case pinmux_ser1: - ret = crisv32_pinmux_dealloc(PORT_C, 4, 7); + ret = __crisv32_pinmux_dealloc(PORT_C, 4, 7); hwprot.ser1 = regk_pinmux_no; break; case pinmux_ser2: - ret = crisv32_pinmux_dealloc(PORT_C, 8, 11); + ret = __crisv32_pinmux_dealloc(PORT_C, 8, 11); hwprot.ser2 = regk_pinmux_no; break; case pinmux_ser3: - ret = crisv32_pinmux_dealloc(PORT_C, 12, 15); + ret = __crisv32_pinmux_dealloc(PORT_C, 12, 15); hwprot.ser3 = regk_pinmux_no; break; case pinmux_sser0: - ret = crisv32_pinmux_dealloc(PORT_C, 0, 3); - ret |= crisv32_pinmux_dealloc(PORT_C, 16, 16); + ret = __crisv32_pinmux_dealloc(PORT_C, 0, 3); + ret |= __crisv32_pinmux_dealloc(PORT_C, 16, 16); hwprot.sser0 = regk_pinmux_no; break; case pinmux_sser1: - ret = crisv32_pinmux_dealloc(PORT_D, 0, 4); + ret = __crisv32_pinmux_dealloc(PORT_D, 0, 4); hwprot.sser1 = regk_pinmux_no; break; case pinmux_ata0: - ret = crisv32_pinmux_dealloc(PORT_D, 5, 7); - ret |= crisv32_pinmux_dealloc(PORT_D, 15, 17); + ret = __crisv32_pinmux_dealloc(PORT_D, 5, 7); + ret |= __crisv32_pinmux_dealloc(PORT_D, 15, 17); hwprot.ata0 = regk_pinmux_no; break; case pinmux_ata1: - ret = crisv32_pinmux_dealloc(PORT_D, 0, 4); - ret |= crisv32_pinmux_dealloc(PORT_E, 17, 17); + ret = __crisv32_pinmux_dealloc(PORT_D, 0, 4); + ret |= __crisv32_pinmux_dealloc(PORT_E, 17, 17); hwprot.ata1 = regk_pinmux_no; break; case pinmux_ata2: - ret = crisv32_pinmux_dealloc(PORT_C, 11, 15); - ret |= crisv32_pinmux_dealloc(PORT_E, 3, 3); + ret = __crisv32_pinmux_dealloc(PORT_C, 11, 15); + ret |= __crisv32_pinmux_dealloc(PORT_E, 3, 3); hwprot.ata2 = regk_pinmux_no; break; case pinmux_ata3: - ret = crisv32_pinmux_dealloc(PORT_C, 8, 10); - ret |= crisv32_pinmux_dealloc(PORT_C, 0, 2); + ret = __crisv32_pinmux_dealloc(PORT_C, 8, 10); + ret |= __crisv32_pinmux_dealloc(PORT_C, 0, 2); hwprot.ata2 = regk_pinmux_no; break; case pinmux_ata: - ret = crisv32_pinmux_dealloc(PORT_B, 0, 15); - ret |= crisv32_pinmux_dealloc(PORT_D, 8, 15); + ret = __crisv32_pinmux_dealloc(PORT_B, 0, 15); + ret |= __crisv32_pinmux_dealloc(PORT_D, 8, 15); hwprot.ata = regk_pinmux_no; break; case pinmux_eth1: - ret = crisv32_pinmux_dealloc(PORT_E, 0, 17); + ret = __crisv32_pinmux_dealloc(PORT_E, 0, 17); hwprot.eth1 = regk_pinmux_no; hwprot.eth1_mgm = regk_pinmux_no; break; case pinmux_timer: - ret = crisv32_pinmux_dealloc(PORT_C, 16, 16); + ret = __crisv32_pinmux_dealloc(PORT_C, 16, 16); hwprot.timer = regk_pinmux_no; spin_unlock_irqrestore(&pinmux_lock, flags); return ret; @@ -293,7 +306,8 @@ int crisv32_pinmux_dealloc_fixed(enum fixed_function function) return ret; } -void crisv32_pinmux_dump(void) +#ifdef DEBUG +static void crisv32_pinmux_dump(void) { int i, j; @@ -305,5 +319,5 @@ void crisv32_pinmux_dump(void) printk(KERN_DEBUG " Pin %d = %d\n", j, pins[i][j]); } } - +#endif __initcall(crisv32_pinmux_init); diff --git a/arch/cris/include/arch-v32/mach-fs/mach/pinmux.h b/arch/cris/include/arch-v32/mach-fs/mach/pinmux.h index c2b3036779df..09bf0c90d2d3 100644 --- a/arch/cris/include/arch-v32/mach-fs/mach/pinmux.h +++ b/arch/cris/include/arch-v32/mach-fs/mach/pinmux.h @@ -28,11 +28,9 @@ enum fixed_function { pinmux_timer }; -int crisv32_pinmux_init(void); int crisv32_pinmux_alloc(int port, int first_pin, int last_pin, enum pin_mode); int crisv32_pinmux_alloc_fixed(enum fixed_function function); int crisv32_pinmux_dealloc(int port, int first_pin, int last_pin); int crisv32_pinmux_dealloc_fixed(enum fixed_function function); -void crisv32_pinmux_dump(void); #endif -- 2.20.1