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net: netcp: add error check to netcp_allocate_rx_buf() 

Currently, if netcp_allocate_rx_buf() fails due no descriptors
in the rx free descriptor queue, inside the netcp_rxpool_refill() function
the iterative loop to fill buffers doesn't terminate right away. So modify
the netcp_allocate_rx_buf() to return an error code and use it break the
loop when there is error.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karicheri, Muralidharan 2015-09-23 13:37:08 -04:00 committed by David S. Miller
parent 736532a070
commit e558b1fbf5
1 changed files with 7 additions and 6 deletions
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13
drivers/net/ethernet/ti/netcp_core.c
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@ -801,7 +801,7 @@ static void netcp_rxpool_free(struct netcp_intf *netcp)
netcp->rx_pool = NULL;
}
static void netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
{
struct knav_dma_desc *hwdesc;
unsigned int buf_len, dma_sz;
@ -815,7 +815,7 @@ static void netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
hwdesc = knav_pool_desc_get(netcp->rx_pool);
if (IS_ERR_OR_NULL(hwdesc)) {
dev_dbg(netcp->ndev_dev, "out of rx pool desc\n");
return;
return -ENOMEM;
}
if (likely(fdq == 0)) {
@ -867,25 +867,26 @@ static void netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
knav_pool_desc_map(netcp->rx_pool, hwdesc, sizeof(*hwdesc), &dma,
&dma_sz);
knav_queue_push(netcp->rx_fdq[fdq], dma, sizeof(*hwdesc), 0);
return;
return 0;
fail:
knav_pool_desc_put(netcp->rx_pool, hwdesc);
return -ENOMEM;
}
/* Refill Rx FDQ with descriptors & attached buffers */
static void netcp_rxpool_refill(struct netcp_intf *netcp)
{
u32 fdq_deficit[KNAV_DMA_FDQ_PER_CHAN] = {0};
int i;
int i, ret = 0;
/* Calculate the FDQ deficit and refill */
for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_fdq[i]; i++) {
fdq_deficit[i] = netcp->rx_queue_depths[i] -
knav_queue_get_count(netcp->rx_fdq[i]);
while (fdq_deficit[i]--)
netcp_allocate_rx_buf(netcp, i);
while (fdq_deficit[i]-- && !ret)
ret = netcp_allocate_rx_buf(netcp, i);
} /* end for fdqs */
}