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drm/i915/sdvo: Reduce the size of the on stack buffers

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The strings we want to print to the on stack buffers should
be no more than
8 * 3 + strlen("(GET_SCALED_HDTV_RESOLUTION_SUPPORT)") + 1 = 61
bytes. So let's shrink the buffers down to 64 bytes.

Also switch the BUG_ON()s to WARN_ON()s if I made a mistake in
my arithmentic.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200108181242.13650-1-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2020-01-08 20:12:34 +02:00
parent 691313ea62
commit cb70b713a8
1 changed files with 8 additions and 11 deletions
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19
drivers/gpu/drm/i915/display/intel_sdvo.c
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@ -414,12 +414,10 @@ static void intel_sdvo_debug_write(struct intel_sdvo *intel_sdvo, u8 cmd,
{
const char *cmd_name;
int i, pos = 0;
#define BUF_LEN 256
char buffer[BUF_LEN];
char buffer[64];
#define BUF_PRINT(args...) \
pos += snprintf(buffer + pos, max_t(int, BUF_LEN - pos, 0), args)
pos += snprintf(buffer + pos, max_t(int, sizeof(buffer) - pos, 0), args)
for (i = 0; i < args_len; i++) {
BUF_PRINT("%02X ", ((u8 *)args)[i]);
@ -433,9 +431,9 @@ static void intel_sdvo_debug_write(struct intel_sdvo *intel_sdvo, u8 cmd,
BUF_PRINT("(%s)", cmd_name);
else
BUF_PRINT("(%02X)", cmd);
BUG_ON(pos >= BUF_LEN - 1);
WARN_ON(pos >= sizeof(buffer) - 1);
#undef BUF_PRINT
#undef BUF_LEN
DRM_DEBUG_KMS("%s: W: %02X %s\n", SDVO_NAME(intel_sdvo), cmd, buffer);
}
@ -540,8 +538,7 @@ static bool intel_sdvo_read_response(struct intel_sdvo *intel_sdvo,
u8 retry = 15; /* 5 quick checks, followed by 10 long checks */
u8 status;
int i, pos = 0;
#define BUF_LEN 256
char buffer[BUF_LEN];
char buffer[64];
buffer[0] = '\0';
@ -581,7 +578,7 @@ static bool intel_sdvo_read_response(struct intel_sdvo *intel_sdvo,
}
#define BUF_PRINT(args...) \
pos += snprintf(buffer + pos, max_t(int, BUF_LEN - pos, 0), args)
pos += snprintf(buffer + pos, max_t(int, sizeof(buffer) - pos, 0), args)
cmd_status = sdvo_cmd_status(status);
if (cmd_status)
@ -600,9 +597,9 @@ static bool intel_sdvo_read_response(struct intel_sdvo *intel_sdvo,
goto log_fail;
BUF_PRINT(" %02X", ((u8 *)response)[i]);
}
BUG_ON(pos >= BUF_LEN - 1);
WARN_ON(pos >= sizeof(buffer) - 1);
#undef BUF_PRINT
#undef BUF_LEN
DRM_DEBUG_KMS("%s: R: %s\n", SDVO_NAME(intel_sdvo), buffer);
return true;