From 475ea1ed14cce2608ed0f12474be2a3d75880eaf Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Wed, 23 Mar 2016 15:37:01 -0700 Subject: [PATCH] staging: comedi: ni_tio: remove BUG() checks for ni_tio_get_gate_src() This function calls some helper functions to convert the counter variant specific gate select bits into the generic enum ni_gpct_clock_source_bits equivelent. These helper functions currently BUG() if the gate select bits are invalid. This should never happen but refactor the code to return -EINVAL instead and remove the BUG() checks. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/ni_tio.c | 146 ++++++++++++++++-------- 1 file changed, 97 insertions(+), 49 deletions(-) diff --git a/drivers/staging/comedi/drivers/ni_tio.c b/drivers/staging/comedi/drivers/ni_tio.c index 564ec9bfd43d..51dd368f788d 100644 --- a/drivers/staging/comedi/drivers/ni_tio.c +++ b/drivers/staging/comedi/drivers/ni_tio.c @@ -1065,114 +1065,157 @@ static int ni_tio_set_other_src(struct ni_gpct *counter, unsigned int index, return 0; } -static unsigned int ni_660x_gate_to_generic_gate(unsigned int gate) +static int ni_660x_gate_to_generic_gate(unsigned int gate, unsigned int *src) { + unsigned int source; unsigned int i; switch (gate) { case NI_660X_SRC_PIN_I_GATE_SEL: - return NI_GPCT_SOURCE_PIN_i_GATE_SELECT; + source = NI_GPCT_SOURCE_PIN_i_GATE_SELECT; + break; case NI_660X_GATE_PIN_I_GATE_SEL: - return NI_GPCT_GATE_PIN_i_GATE_SELECT; + source = NI_GPCT_GATE_PIN_i_GATE_SELECT; + break; case NI_660X_NEXT_SRC_GATE_SEL: - return NI_GPCT_NEXT_SOURCE_GATE_SELECT; + source = NI_GPCT_NEXT_SOURCE_GATE_SELECT; + break; case NI_660X_NEXT_OUT_GATE_SEL: - return NI_GPCT_NEXT_OUT_GATE_SELECT; + source = NI_GPCT_NEXT_OUT_GATE_SELECT; + break; case NI_660X_LOGIC_LOW_GATE_SEL: - return NI_GPCT_LOGIC_LOW_GATE_SELECT; + source = NI_GPCT_LOGIC_LOW_GATE_SELECT; + break; default: for (i = 0; i <= NI_660X_MAX_RTSI_CHAN; ++i) { - if (gate == NI_660X_RTSI_GATE_SEL(i)) - return NI_GPCT_RTSI_GATE_SELECT(i); + if (gate == NI_660X_RTSI_GATE_SEL(i)) { + source = NI_GPCT_RTSI_GATE_SELECT(i); + break; + } } + if (i <= NI_660X_MAX_RTSI_CHAN) + break; for (i = 0; i <= NI_660X_MAX_GATE_PIN; ++i) { - if (gate == NI_660X_PIN_GATE_SEL(i)) - return NI_GPCT_GATE_PIN_GATE_SELECT(i); + if (gate == NI_660X_PIN_GATE_SEL(i)) { + source = NI_GPCT_GATE_PIN_GATE_SELECT(i); + break; + } } - BUG(); - break; + if (i <= NI_660X_MAX_GATE_PIN) + break; + return -EINVAL; } + *src = source; return 0; }; -static unsigned int ni_m_gate_to_generic_gate(unsigned int gate) +static int ni_m_gate_to_generic_gate(unsigned int gate, unsigned int *src) { + unsigned int source; unsigned int i; switch (gate) { case NI_M_TIMESTAMP_MUX_GATE_SEL: - return NI_GPCT_TIMESTAMP_MUX_GATE_SELECT; + source = NI_GPCT_TIMESTAMP_MUX_GATE_SELECT; + break; case NI_M_AI_START2_GATE_SEL: - return NI_GPCT_AI_START2_GATE_SELECT; + source = NI_GPCT_AI_START2_GATE_SELECT; + break; case NI_M_PXI_STAR_TRIGGER_GATE_SEL: - return NI_GPCT_PXI_STAR_TRIGGER_GATE_SELECT; + source = NI_GPCT_PXI_STAR_TRIGGER_GATE_SELECT; + break; case NI_M_NEXT_OUT_GATE_SEL: - return NI_GPCT_NEXT_OUT_GATE_SELECT; + source = NI_GPCT_NEXT_OUT_GATE_SELECT; + break; case NI_M_AI_START1_GATE_SEL: - return NI_GPCT_AI_START1_GATE_SELECT; + source = NI_GPCT_AI_START1_GATE_SELECT; + break; case NI_M_NEXT_SRC_GATE_SEL: - return NI_GPCT_NEXT_SOURCE_GATE_SELECT; + source = NI_GPCT_NEXT_SOURCE_GATE_SELECT; + break; case NI_M_ANALOG_TRIG_OUT_GATE_SEL: - return NI_GPCT_ANALOG_TRIGGER_OUT_GATE_SELECT; + source = NI_GPCT_ANALOG_TRIGGER_OUT_GATE_SELECT; + break; case NI_M_LOGIC_LOW_GATE_SEL: - return NI_GPCT_LOGIC_LOW_GATE_SELECT; + source = NI_GPCT_LOGIC_LOW_GATE_SELECT; + break; default: for (i = 0; i <= NI_M_MAX_RTSI_CHAN; ++i) { - if (gate == NI_M_RTSI_GATE_SEL(i)) - return NI_GPCT_RTSI_GATE_SELECT(i); + if (gate == NI_M_RTSI_GATE_SEL(i)) { + source = NI_GPCT_RTSI_GATE_SELECT(i); + break; + } } + if (i <= NI_M_MAX_RTSI_CHAN) + break; for (i = 0; i <= NI_M_MAX_PFI_CHAN; ++i) { - if (gate == NI_M_PFI_GATE_SEL(i)) - return NI_GPCT_PFI_GATE_SELECT(i); + if (gate == NI_M_PFI_GATE_SEL(i)) { + source = NI_GPCT_PFI_GATE_SELECT(i); + break; + } } - BUG(); - break; + if (i <= NI_M_MAX_PFI_CHAN) + break; + return -EINVAL; } + *src = source; return 0; }; -static unsigned int ni_660x_gate2_to_generic_gate(unsigned int gate) +static int ni_660x_gate2_to_generic_gate(unsigned int gate, unsigned int *src) { + unsigned int source; unsigned int i; switch (gate) { case NI_660X_SRC_PIN_I_GATE2_SEL: - return NI_GPCT_SOURCE_PIN_i_GATE_SELECT; + source = NI_GPCT_SOURCE_PIN_i_GATE_SELECT; + break; case NI_660X_UD_PIN_I_GATE2_SEL: - return NI_GPCT_UP_DOWN_PIN_i_GATE_SELECT; + source = NI_GPCT_UP_DOWN_PIN_i_GATE_SELECT; + break; case NI_660X_NEXT_SRC_GATE2_SEL: - return NI_GPCT_NEXT_SOURCE_GATE_SELECT; + source = NI_GPCT_NEXT_SOURCE_GATE_SELECT; + break; case NI_660X_NEXT_OUT_GATE2_SEL: - return NI_GPCT_NEXT_OUT_GATE_SELECT; + source = NI_GPCT_NEXT_OUT_GATE_SELECT; + break; case NI_660X_SELECTED_GATE2_SEL: - return NI_GPCT_SELECTED_GATE_GATE_SELECT; + source = NI_GPCT_SELECTED_GATE_GATE_SELECT; + break; case NI_660X_LOGIC_LOW_GATE2_SEL: - return NI_GPCT_LOGIC_LOW_GATE_SELECT; + source = NI_GPCT_LOGIC_LOW_GATE_SELECT; + break; default: for (i = 0; i <= NI_660X_MAX_RTSI_CHAN; ++i) { - if (gate == NI_660X_RTSI_GATE2_SEL(i)) - return NI_GPCT_RTSI_GATE_SELECT(i); + if (gate == NI_660X_RTSI_GATE2_SEL(i)) { + source = NI_GPCT_RTSI_GATE_SELECT(i); + break; + } } + if (i <= NI_660X_MAX_RTSI_CHAN) + break; for (i = 0; i <= NI_660X_MAX_UP_DOWN_PIN; ++i) { - if (gate == NI_660X_UD_PIN_GATE2_SEL(i)) - return NI_GPCT_UP_DOWN_PIN_GATE_SELECT(i); + if (gate == NI_660X_UD_PIN_GATE2_SEL(i)) { + source = NI_GPCT_UP_DOWN_PIN_GATE_SELECT(i); + break; + } } - BUG(); - break; + if (i <= NI_660X_MAX_UP_DOWN_PIN) + break; + return -EINVAL; } + *src = source; return 0; }; -static unsigned int ni_m_gate2_to_generic_gate(unsigned int gate) +static int ni_m_gate2_to_generic_gate(unsigned int gate, unsigned int *src) { /* * FIXME: the second gate sources for the m series are undocumented, * so we just return the raw bits for now. */ - switch (gate) { - default: - return gate; - } + *src = gate; return 0; }; @@ -1184,6 +1227,7 @@ static int ni_tio_get_gate_src(struct ni_gpct *counter, unsigned int gate_index, unsigned int mode; unsigned int reg; unsigned int gate; + int ret; mode = ni_tio_get_soft_copy(counter, NITIO_MODE_REG(cidx)); if (((mode & GI_GATING_MODE_MASK) == GI_GATING_DISABLED) || @@ -1202,12 +1246,14 @@ static int ni_tio_get_gate_src(struct ni_gpct *counter, unsigned int gate_index, case ni_gpct_variant_e_series: case ni_gpct_variant_m_series: default: - *gate_source = ni_m_gate_to_generic_gate(gate); + ret = ni_m_gate_to_generic_gate(gate, gate_source); break; case ni_gpct_variant_660x: - *gate_source = ni_660x_gate_to_generic_gate(gate); + ret = ni_660x_gate_to_generic_gate(gate, gate_source); break; } + if (ret) + return ret; if (mode & GI_GATE_POL_INVERT) *gate_source |= CR_INVERT; if ((mode & GI_GATING_MODE_MASK) != GI_LEVEL_GATING) @@ -1221,12 +1267,14 @@ static int ni_tio_get_gate_src(struct ni_gpct *counter, unsigned int gate_index, case ni_gpct_variant_e_series: case ni_gpct_variant_m_series: default: - *gate_source = ni_m_gate2_to_generic_gate(gate); + ret = ni_m_gate2_to_generic_gate(gate, gate_source); break; case ni_gpct_variant_660x: - *gate_source = ni_660x_gate2_to_generic_gate(gate); + ret = ni_660x_gate2_to_generic_gate(gate, gate_source); break; } + if (ret) + return ret; if (counter_dev->regs[reg] & GI_GATE2_POL_INVERT) *gate_source |= CR_INVERT; /* second gate can't have edge/level mode set independently */ -- 2.20.1