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staging/rdma/hfi1: Add a credit push on diagpkt allocate fail 

When sending a diagnostic packet, if the send context does not
have enough room, force a credit return and try again.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dean Luick 2015-12-01 15:38:17 -05:00 committed by Greg Kroah-Hartman
parent 05087f3b22
commit d22f9d6bf5
1 changed files with 8 additions and 0 deletions
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8
drivers/staging/rdma/hfi1/diag.c
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@ -379,6 +379,7 @@ static ssize_t diagpkt_send(struct diag_pkt *dp)
pio_release_cb credit_cb = NULL; pio_release_cb credit_cb = NULL;
void *credit_arg = NULL; void *credit_arg = NULL;
struct diagpkt_wait *wait = NULL; struct diagpkt_wait *wait = NULL;
int trycount = 0;
dd = hfi1_lookup(dp->unit); dd = hfi1_lookup(dp->unit);
if (!dd || !(dd->flags & HFI1_PRESENT) || !dd->kregbase) { if (!dd || !(dd->flags & HFI1_PRESENT) || !dd->kregbase) {
@ -493,8 +494,15 @@ static ssize_t diagpkt_send(struct diag_pkt *dp)
credit_arg = wait; credit_arg = wait;
} }
retry:
pbuf = sc_buffer_alloc(sc, total_len, credit_cb, credit_arg); pbuf = sc_buffer_alloc(sc, total_len, credit_cb, credit_arg);
if (!pbuf) { if (!pbuf) {
if (trycount == 0) {
/* force a credit return and try again */
sc_return_credits(sc);
trycount = 1;
goto retry;
}
/* /*
* No send buffer means no credit callback. Undo * No send buffer means no credit callback. Undo
* the wait set-up that was done above. We free wait * the wait set-up that was done above. We free wait