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media: ipu3-cio2: Replace infinite loop by one with clear exit condition

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Refactor cio2_buffer_done() to get rid of infinite loop by replacing it by
one with clear exit condition. This change also allows to check for an
error ahead.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Andy Shevchenko 2020-08-17 18:07:28 +02:00 committed by Mauro Carvalho Chehab
parent 9a262c7a7f
commit a553c90136
1 changed files with 11 additions and 13 deletions
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24
drivers/media/pci/intel/ipu3/ipu3-cio2.c
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@ -540,7 +540,7 @@ static void cio2_buffer_done(struct cio2_device *cio2, unsigned int dma_chan)
{
struct device *dev = &cio2->pci_dev->dev;
struct cio2_queue *q = cio2->cur_queue;
int buffers_found = 0;
struct cio2_fbpt_entry *entry;
u64 ns = ktime_get_ns();
if (dma_chan >= CIO2_QUEUES) {
@ -548,15 +548,18 @@ static void cio2_buffer_done(struct cio2_device *cio2, unsigned int dma_chan)
return;
}
entry = &q->fbpt[q->bufs_first * CIO2_MAX_LOPS];
if (entry->first_entry.ctrl & CIO2_FBPT_CTRL_VALID) {
dev_warn(&cio2->pci_dev->dev,
"no ready buffers found on DMA channel %u\n",
dma_chan);
return;
}
/* Find out which buffer(s) are ready */
do {
struct cio2_fbpt_entry *const entry =
&q->fbpt[q->bufs_first * CIO2_MAX_LOPS];
struct cio2_buffer *b;
if (entry->first_entry.ctrl & CIO2_FBPT_CTRL_VALID)
break;
b = q->bufs[q->bufs_first];
if (b) {
unsigned int bytes = entry[1].second_entry.num_of_bytes;
@ -578,13 +581,8 @@ static void cio2_buffer_done(struct cio2_device *cio2, unsigned int dma_chan)
atomic_inc(&q->frame_sequence);
cio2_fbpt_entry_init_dummy(cio2, entry);
q->bufs_first = (q->bufs_first + 1) % CIO2_MAX_BUFFERS;
buffers_found++;
} while (1);
if (buffers_found == 0)
dev_warn(&cio2->pci_dev->dev,
"no ready buffers found on DMA channel %u\n",
dma_chan);
entry = &q->fbpt[q->bufs_first * CIO2_MAX_LOPS];
} while (!(entry->first_entry.ctrl & CIO2_FBPT_CTRL_VALID));
}
static void cio2_queue_event_sof(struct cio2_device *cio2, struct cio2_queue *q)