Messages in this thread Patch in this message |  | | Date | Tue, 3 Sep 2002 14:06:26 -0400 | Subject | [patch] qlogic "this should not happen" | From | rwhron@earthlin ... |
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Patch tested on 2.5.31, 2.5.31-mm1, 2.5.32-mm1, 2.5.32-mm2.
Without patch, 2.5.x during heavy benchmark/stress testing eventually locks up with these final messages:
kernel: qlogicfc0 : no handle slots, this should not happen. kernel: hostdata->queued is 6, in_ptr: 7d
Derived from Doug Ledford's patch: http://marc.theaimsgroup.com/?l=linux-kernel&m=103005703808312&w=2 and Eric Weigle's patch: http://marc.theaimsgroup.com/?l=linux-kernel&m=103005790509079&w=2
2.5.33 locked up without the patch.
diff -ruN linux-2.5.33/drivers/scsi/qlogicfc.c linux/drivers/scsi/qlogicfc.c --- linux-2.5.33/drivers/scsi/qlogicfc.c 2002-07-24 19:09:03.000000000 -0400 +++ linux/drivers/scsi/qlogicfc.c 2002-09-01 16:44:33.000000000 -0400 @@ -1342,18 +1342,11 @@
num_free = QLOGICFC_REQ_QUEUE_LEN - REQ_QUEUE_DEPTH(in_ptr, out_ptr); num_free = (num_free > 2) ? num_free - 2 : 0; - host->can_queue = hostdata->queued + num_free; + host->can_queue = host->host_busy + num_free; if (host->can_queue > QLOGICFC_REQ_QUEUE_LEN) host->can_queue = QLOGICFC_REQ_QUEUE_LEN; host->sg_tablesize = QLOGICFC_MAX_SG(num_free);
- /* this is really gross */ - if (host->can_queue <= host->host_busy){ - if (host->can_queue+2 < host->host_busy) - DEBUG(printk("qlogicfc%d.c crosses its fingers.\n", hostdata->host_id)); - host->can_queue = host->host_busy + 1; - } - LEAVE("isp2x00_queuecommand");
return 0; @@ -1623,17 +1616,11 @@
num_free = QLOGICFC_REQ_QUEUE_LEN - REQ_QUEUE_DEPTH(in_ptr, out_ptr); num_free = (num_free > 2) ? num_free - 2 : 0; - host->can_queue = hostdata->queued + num_free; + host->can_queue = host->host_busy + num_free; if (host->can_queue > QLOGICFC_REQ_QUEUE_LEN) host->can_queue = QLOGICFC_REQ_QUEUE_LEN; host->sg_tablesize = QLOGICFC_MAX_SG(num_free);
- if (host->can_queue <= host->host_busy){ - if (host->can_queue+2 < host->host_busy) - DEBUG(printk("qlogicfc%d : crosses its fingers.\n", hostdata->host_id)); - host->can_queue = host->host_busy + 1; - } - outw(HCCR_CLEAR_RISC_INTR, host->io_port + HOST_HCCR); LEAVE_INTR("isp2x00_intr_handler"); } diff -ruN linux-2.5.33/drivers/scsi/qlogicfc.h linux/drivers/scsi/qlogicfc.h --- linux-2.5.33/drivers/scsi/qlogicfc.h 2002-07-24 19:09:03.000000000 -0400 +++ linux/drivers/scsi/qlogicfc.h 2002-09-01 16:41:47.000000000 -0400 @@ -65,7 +65,7 @@ #define DATASEGS_PER_COMMAND 2 #define DATASEGS_PER_CONT 5
-#define QLOGICFC_REQ_QUEUE_LEN 127 /* must be power of two - 1 */ +#define QLOGICFC_REQ_QUEUE_LEN 255 /* must be power of two - 1 */ #define QLOGICFC_MAX_SG(ql) (DATASEGS_PER_COMMAND + (((ql) > 0) ? DATASEGS_PER_CONT*((ql) - 1) : 0)) #define QLOGICFC_CMD_PER_LUN 8
-- Randy Hron http://home.earthlink.net/~rwhron/kernel/bigbox.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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