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SubjectRe: [PATCH] [media] staging: use mutex_lock() in s2250_probe().


Am 17.03.2012 18:36, schrieb santosh nayak:
> From: Santosh Nayak <santoshprasadnayak@gmail.com>
>
> Use uninterruptable sleep lock 'mutex_lock()' in place of
> mutex_lock_interruptible() because there is no userspace
> for s2250_probe().
>
> Return -ENOMEM if kzalloc() fails to allocate and initialize.
>
> Signed-off-by: Santosh Nayak <santoshprasadnayak@gmail.com>
> ---
> drivers/staging/media/go7007/s2250-board.c | 43 +++++++++++++++------------
> 1 files changed, 24 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/staging/media/go7007/s2250-board.c b/drivers/staging/media/go7007/s2250-board.c
> index 014d384..1406a37 100644
> --- a/drivers/staging/media/go7007/s2250-board.c
> +++ b/drivers/staging/media/go7007/s2250-board.c
> @@ -637,27 +637,32 @@ static int s2250_probe(struct i2c_client *client,
> state->audio_input = 0;
> write_reg(client, 0x08, 0x02); /* Line In */
>
> - if (mutex_lock_interruptible(&usb->i2c_lock) == 0) {
> - data = kzalloc(16, GFP_KERNEL);
> - if (data != NULL) {
> - int rc;
> - rc = go7007_usb_vendor_request(go, 0x41, 0, 0,
> - data, 16, 1);
> - if (rc > 0) {
> - u8 mask;
> - data[0] = 0;
> - mask = 1<<5;
> - data[0] &= ~mask;
> - data[1] |= mask;
> - go7007_usb_vendor_request(go, 0x40, 0,
> - (data[1]<<8)
> - + data[1],
> - data, 16, 0);
> - }
> - kfree(data);
> - }
> + mutex_lock(&usb->i2c_lock);
> + data = kzalloc(16, GFP_KERNEL);
> + if (data == NULL) {
> + i2c_unregister_device(audio);
> + kfree(state);
> mutex_unlock(&usb->i2c_lock);
> + return -ENOMEM;
> + } else {
> + int rc;
> + rc = go7007_usb_vendor_request(go, 0x41, 0, 0,
> + data, 16, 1);
> + if (rc > 0) {
> + u8 mask;
> + data[0] = 0;
> + mask = 1<<5;
> + data[0] &= ~mask;
> + data[1] |= mask;
> + go7007_usb_vendor_request(go, 0x40, 0,
> + (data[1]<<8)
> + + data[1],
> + data, 16, 0);
> + }
> + kfree(data);
> }
> + mutex_unlock(&usb->i2c_lock);
> +
>
> v4l2_info(sd, "initialized successfully\n");
> return 0;

hi,
You can drop the else
1. there is no 3. way
2. you can save 1 indent level

just one question: the (data[1]<<8)+ data[1] is intended ? always data[1] ?
(i have no clue, it is the original code, it just feels .. strange )

re,
wh


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