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Commit aa7374ac authored by Mike Marciniszyn's avatar Mike Marciniszyn Committed by Roland Dreier
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IB/qib: Avoid duplicate writes to the rcv head register 



Avoid duplicate writes to the head register as this can lead to lost
interrupts if the context goes full before the second write is done.

Signed-off-by: default avatarMike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent e706203c

drivers/infiniband/hw/qib/qib_driver.c

+9 −1
Original line number Diff line number Diff line
@@ -71,6 +71,11 @@ MODULE_DESCRIPTION("QLogic IB driver"); 
 */

#define QIB_PIO_MAXIBHDR 128



/*

 * QIB_MAX_PKT_RCV is the max # if packets processed per receive interrupt.

 */

#define QIB_MAX_PKT_RECV 64



struct qlogic_ib_stats qib_stats;



const char *qib_get_unit_name(int unit)
@@ -335,7 +340,7 @@ u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts) 
		smp_rmb();  /* prevent speculative reads of dma'ed hdrq */

	}



	for (last = 0, i = 1; !last && i <= 64; i += !last) {

	for (last = 0, i = 1; !last; i += !last) {

		hdr = dd->f_get_msgheader(dd, rhf_addr);

		eflags = qib_hdrget_err_flags(rhf_addr);

		etype = qib_hdrget_rcv_type(rhf_addr);
@@ -384,6 +389,9 @@ u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts) 
		l += rsize;

		if (l >= maxcnt)

			l = 0;

		if (i == QIB_MAX_PKT_RECV)

			last = 1;



		rhf_addr = (__le32 *) rcd->rcvhdrq + l + dd->rhf_offset;

		if (dd->flags & QIB_NODMA_RTAIL) {

			u32 seq = qib_hdrget_seq(rhf_addr);