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HID: i2c-hid: reorder allocation/free of buffers

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Simplifies i2c_hid_alloc_buffers tests, and makes this function
responsible of the assignment of ihid->bufsize.
The condition for the reallocation in i2c_hid_start is then simpler.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2012-12-05 15:02:54 +01:00 committed by Jiri Kosina
parent 27174cff8f
commit 29b45787d1
1 changed files with 34 additions and 46 deletions
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80
drivers/hid/i2c-hid/i2c-hid.c
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@ -464,40 +464,6 @@ static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
}
}
static int i2c_hid_alloc_buffers(struct i2c_hid *ihid)
{
/* the worst case is computed from the set_report command with a
* reportID > 15 and the maximum report length */
int args_len = sizeof(__u8) + /* optional ReportID byte */
sizeof(__u16) + /* data register */
sizeof(__u16) + /* size of the report */
ihid->bufsize; /* report */
ihid->inbuf = kzalloc(ihid->bufsize, GFP_KERNEL);
if (!ihid->inbuf)
return -ENOMEM;
ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
if (!ihid->argsbuf) {
kfree(ihid->inbuf);
return -ENOMEM;
}
ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
if (!ihid->cmdbuf) {
kfree(ihid->inbuf);
kfree(ihid->argsbuf);
ihid->inbuf = NULL;
ihid->argsbuf = NULL;
return -ENOMEM;
}
return 0;
}
static void i2c_hid_free_buffers(struct i2c_hid *ihid)
{
kfree(ihid->inbuf);
@ -506,6 +472,30 @@ static void i2c_hid_free_buffers(struct i2c_hid *ihid)
ihid->inbuf = NULL;
ihid->cmdbuf = NULL;
ihid->argsbuf = NULL;
ihid->bufsize = 0;
}
static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
{
/* the worst case is computed from the set_report command with a
* reportID > 15 and the maximum report length */
int args_len = sizeof(__u8) + /* optional ReportID byte */
sizeof(__u16) + /* data register */
sizeof(__u16) + /* size of the report */
report_size; /* report */
ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
if (!ihid->inbuf || !ihid->argsbuf || !ihid->cmdbuf) {
i2c_hid_free_buffers(ihid);
return -ENOMEM;
}
ihid->bufsize = report_size;
return 0;
}
static int i2c_hid_get_raw_report(struct hid_device *hid,
@ -610,22 +600,19 @@ static int i2c_hid_start(struct hid_device *hid)
struct i2c_client *client = hid->driver_data;
struct i2c_hid *ihid = i2c_get_clientdata(client);
int ret;
int old_bufsize = ihid->bufsize;
unsigned int bufsize = HID_MIN_BUFFER_SIZE;
ihid->bufsize = HID_MIN_BUFFER_SIZE;
i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &ihid->bufsize);
i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &ihid->bufsize);
i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &ihid->bufsize);
i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
if (ihid->bufsize > old_bufsize || !ihid->inbuf || !ihid->cmdbuf) {
if (bufsize > ihid->bufsize) {
i2c_hid_free_buffers(ihid);
ret = i2c_hid_alloc_buffers(ihid);
ret = i2c_hid_alloc_buffers(ihid, bufsize);
if (ret) {
ihid->bufsize = old_bufsize;
if (ret)
return ret;
}
}
if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
@ -849,8 +836,9 @@ static int __devinit i2c_hid_probe(struct i2c_client *client,
/* we need to allocate the command buffer without knowing the maximum
* size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
* real computation later. */
ihid->bufsize = HID_MIN_BUFFER_SIZE;
i2c_hid_alloc_buffers(ihid);
ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
if (ret < 0)
goto err;
ret = i2c_hid_fetch_hid_descriptor(ihid);
if (ret < 0)