From: Uri Shkolnik <urishk@yahoo.com>
To: LinuxML <linux-media@vger.kernel.org>
Subject: [PATCH] [0905_24] Siano: smscore - fix get_common_buffer bug
Date: Sun, 17 May 2009 01:59:37 -0700 (PDT) [thread overview]
Message-ID: <169030.30544.qm@web110813.mail.gq1.yahoo.com> (raw)
# HG changeset patch
# User Uri Shkolnik <uris@siano-ms.com>
# Date 1242331867 -10800
# Node ID fc839f80e81fed027a4721f5c679b9af7e27c867
# Parent 415ca02f74b960c02ddfa7ee719cf87726d97490
[0905_24] Siano: smscore - fix get_common_buffer bug
From: Uri Shkolnik <uris@siano-ms.com>
get common buffers() should block operation until valid buffer
is avaliable.
Priority: normal
Signed-off-by: Uri Shkolnik <uris@siano-ms.com>
diff -r 415ca02f74b9 -r fc839f80e81f linux/drivers/media/dvb/siano/smscoreapi.c
--- a/linux/drivers/media/dvb/siano/smscoreapi.c Thu May 14 23:02:05 2009 +0300
+++ b/linux/drivers/media/dvb/siano/smscoreapi.c Thu May 14 23:11:07 2009 +0300
@@ -30,6 +30,7 @@
#include <linux/io.h>
#include <linux/firmware.h>
+#include <linux/wait.h>
#include "smscoreapi.h"
#include "smsendian.h"
@@ -356,6 +357,9 @@ int smscore_register_device(struct smsde
init_completion(&dev->gpio_set_level_done);
init_completion(&dev->gpio_get_level_done);
init_completion(&dev->ir_init_done);
+
+ /* Buffer management */
+ init_waitqueue_head(&dev->buffer_mng_waitq);
/* alloc common buffer */
dev->common_buffer_size = params->buffer_size * params->num_buffers;
@@ -694,7 +698,9 @@ void smscore_unregister_device(struct sm
* onresponse must no longer be called */
while (1) {
- while ((cb = smscore_getbuffer(coredev))) {
+ while (!list_empty(&coredev->buffers)) {
+ cb = (struct smscore_buffer_t *) coredev->buffers.next;
+ list_del(&cb->entry);
kfree(cb);
num_buffers++;
}
@@ -715,8 +721,10 @@ void smscore_unregister_device(struct sm
if (coredev->common_buffer)
dma_free_coherent(NULL, coredev->common_buffer_size,
- coredev->common_buffer,
- coredev->common_buffer_phys);
+ coredev->common_buffer, coredev->common_buffer_phys);
+
+ if (coredev->fw_buf != NULL)
+ kfree(coredev->fw_buf);
list_del(&coredev->entry);
kfree(coredev);
@@ -1105,12 +1113,24 @@ struct smscore_buffer_t *smscore_getbuff
struct smscore_buffer_t *cb = NULL;
unsigned long flags;
+ DEFINE_WAIT(wait);
+
spin_lock_irqsave(&coredev->bufferslock, flags);
- if (!list_empty(&coredev->buffers)) {
- cb = (struct smscore_buffer_t *) coredev->buffers.next;
- list_del(&cb->entry);
- }
+ /* This function must return a valid buffer, since the buffer list is
+ * finite, we check that there is an available buffer, if not, we wait
+ * until such buffer become available.
+ */
+
+ prepare_to_wait(&coredev->buffer_mng_waitq, &wait, TASK_INTERRUPTIBLE);
+
+ if (list_empty(&coredev->buffers))
+ schedule();
+
+ finish_wait(&coredev->buffer_mng_waitq, &wait);
+
+ cb = (struct smscore_buffer_t *) coredev->buffers.next;
+ list_del(&cb->entry);
spin_unlock_irqrestore(&coredev->bufferslock, flags);
@@ -1127,8 +1147,8 @@ EXPORT_SYMBOL_GPL(smscore_getbuffer);
*
*/
void smscore_putbuffer(struct smscore_device_t *coredev,
- struct smscore_buffer_t *cb)
-{
+ struct smscore_buffer_t *cb) {
+ wake_up_interruptible(&coredev->buffer_mng_waitq);
list_add_locked(&cb->entry, &coredev->buffers, &coredev->bufferslock);
}
EXPORT_SYMBOL_GPL(smscore_putbuffer);
reply other threads:[~2009-05-17 8:59 UTC|newest]
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