[Intel-gfx] linux-4.15-rc1/drivers/gpu/drm/i915/gvt/cmd_parser.c:1640: poor error checking ?

[David Binderman]

Hello there,

linux-4.15-rc1/drivers/gpu/drm/i915/gvt/cmd_parser.c:1640]: (style) Checking if 
unsigned variable 'bb_size' is less than zero.

Source code is

/* get the size of the batch buffer */
bb_size = find_bb_size(s);
if (bb_size < 0)
return -EINVAL;

but

static int find_bb_size(struct parser_exec_state *s)

so the code isn't properly checking the return value. Suggest code rework.

Regards

David Binderman
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[Intel-gfx] drivers/gpu/drm/i915/intel_pm.c:4467: bad comparison ?

[David Binderman]

Hello there,

drivers/gpu/drm/i915/intel_pm.c:4467]: (warning) Comparison of a boolean 
expression with an integer other than 0 or 1.

Source code is

else if ((ddb_allocation && ddb_allocation /
fixed_16_16_to_u32_round_up(plane_blocks_per_line)) >= 1)

Regards

David Binderman
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[Intel-gfx] include/drm/i915_drm.h:96: possible bad bitmask ?

[David Binderman]

Hello there,

Recent versions of gcc say this:

include/drm/i915_drm.h:96:34: warning: result of ‘65535 << 20’
requires 37 bits to represent, but ‘int’ only has 32 bits
[-Wshift-overflow=]

Source code is

#define   INTEL_BSM_MASK (0x << 20)

Maybe something like

#define   INTEL_BSM_MASK (0xUL<< 20)

might be better.


Regards

David Binderman
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[Intel-gfx] drivers/gpu/drm/i915/i915_reg.h:90:shift-overflow problem ?

[David Binderman]

Hello there,

drivers/gpu/drm/i915/i915_reg.h:90:28: warning: result of ‘65535 <<
20’ requires 37 bits to represent, but ‘int’ only has 32 bits
[-Wshift-overflow=]

Source code is

#define   BSM_MASK (0x << 20)

Maybe better code

#define   BSM_MASK (((unsigned long) 0x) << 20)


Regards

David Binderman
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[Intel-gfx] linux-4.2-rc1/drivers/gpu/drm/i915/intel_csr.c:353: bad if statement ?

[David Binderman]

Hello there,

[linux-4.2-rc1/drivers/gpu/drm/i915/intel_csr.c:353]: (warning) Logical 
conjunction always evaluates to false: EXPR  524288  EXPR 589823.

Source code is

  if (dmc_header-mmioaddr[i]  CSR_MMIO_START_RANGE 
    dmc_header-mmioaddr[i] CSR_MMIO_END_RANGE) {

Maybe better code

  if (dmc_header-mmioaddr[i]  CSR_MMIO_START_RANGE ||
    dmc_header-mmioaddr[i] CSR_MMIO_END_RANGE) {

Regards

David Binderman

  
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