From: Stefan Richter Date: Wed, 22 Jun 2011 19:05:08 +0000 (+0200) Subject: firewire: ohci: fix PHY reg access after card ejection X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=215fa444c2a6d571f1f915cf3dc7a8b01cc51a0a;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git firewire: ohci: fix PHY reg access after card ejection Detect and handle ejection of FireWire CardBus cards in PHY register accesses: - The last attempt of firewire-core to reset the bus during shutdown caused a spurious "firewire_ohci: failed to write phy reg" error message in the log. Skip this message as well as the prior retry loop that needlessly took 100 milliseconds. - In the unlikely case that a PHY register was read right after card ejection, a bogus value was obtained and possibly acted upon. Instead, fail the read attempt. Signed-off-by: Stefan Richter --- diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index a818dc83469..44859887627 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -527,6 +527,9 @@ static int read_phy_reg(struct fw_ohci *ohci, int addr) reg_write(ohci, OHCI1394_PhyControl, OHCI1394_PhyControl_Read(addr)); for (i = 0; i < 3 + 100; i++) { val = reg_read(ohci, OHCI1394_PhyControl); + if (!~val) + return -ENODEV; /* Card was ejected. */ + if (val & OHCI1394_PhyControl_ReadDone) return OHCI1394_PhyControl_ReadData(val); @@ -550,6 +553,9 @@ static int write_phy_reg(const struct fw_ohci *ohci, int addr, u32 val) OHCI1394_PhyControl_Write(addr, val)); for (i = 0; i < 3 + 100; i++) { val = reg_read(ohci, OHCI1394_PhyControl); + if (!~val) + return -ENODEV; /* Card was ejected. */ + if (!(val & OHCI1394_PhyControl_WritePending)) return 0;