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Input: sur40 - fix DMA on stack 

During the initialisation the driver uses a buffer on the stack for DMA.
That violates the cache coherency rules. The fix is to allocate the buffer
with kmalloc().

Signed-off-by: Oliver Neukum <ONeukum@suse.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Oliver Neukum 2016-03-23 14:36:56 -07:00 committed by Dmitry Torokhov
parent 950336ba3e
commit d314e9e80c
1 changed files with 14 additions and 7 deletions
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21
drivers/input/touchscreen/sur40.c
View File

@ -197,28 +197,34 @@ static int sur40_command(struct sur40_state *dev,
static int sur40_init(struct sur40_state *dev)
{
int result;
u8 buffer[24];
u8 *buffer;
buffer = kmalloc(24, GFP_KERNEL);
if (!buffer) {
result = -ENOMEM;
goto error;
}
/* stupidly replay the original MS driver init sequence */
result = sur40_command(dev, SUR40_GET_VERSION, 0x00, buffer, 12);
if (result < 0)
return result;
goto error;
result = sur40_command(dev, SUR40_GET_VERSION, 0x01, buffer, 12);
if (result < 0)
return result;
goto error;
result = sur40_command(dev, SUR40_GET_VERSION, 0x02, buffer, 12);
if (result < 0)
return result;
goto error;
result = sur40_command(dev, SUR40_UNKNOWN2, 0x00, buffer, 24);
if (result < 0)
return result;
goto error;
result = sur40_command(dev, SUR40_UNKNOWN1, 0x00, buffer, 5);
if (result < 0)
return result;
goto error;
result = sur40_command(dev, SUR40_GET_VERSION, 0x03, buffer, 12);
@ -226,7 +232,8 @@ static int sur40_init(struct sur40_state *dev)
* Discard the result buffer - no known data inside except
* some version strings, maybe extract these sometime...
*/
error:
kfree(buffer);
return result;
}