[Bug,1919036] Re: Assertion failure in fifo8_push_all() through am53c974

Commit Message

Mark Cave-Ayland March 14, 2021, 11:39 a.m. UTC

Thanks for the test case - looks like the problem occurs because a
command hasn't been submitted before initiating a DMA transfer, and TC
is set to a value higher than the size of cmdfifo. Can you confirm that
the following fix works for you?



ATB,

Mark.

Comments

[e-mail] March 14, 2021, 11:51 a.m. UTC | #1

Patchew URL: https://patchew.org/QEMU/[e-mail]/



Hi,

This series seems to have some coding style problems. See output below for
more information:

Type: series
Message-id: [e-mail]
Subject: [Bug 1919036] Re: Assertion failure in fifo8_push_all() through am53c974

=== TEST SCRIPT BEGIN ===
#!/bin/bash
git rev-parse base > /dev/null || exit 0
git config --local diff.renamelimit 0
git config --local diff.renames True
git config --local diff.algorithm histogram
./scripts/checkpatch.pl --mailback base..
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
From https://github.com/patchew-project/qemu
   3f8d188..8e6bc6c  master     -> master
 * [new tag]         patchew/[e-mail] -> patchew/[e-mail]
Switched to a new branch 'test'
adbf373 Assertion failure in fifo8_push_all() through am53c974

=== OUTPUT BEGIN ===
ERROR: Missing Signed-off-by: line(s)

total: 1 errors, 0 warnings, 7 lines checked

Commit adbf373a9928 (Assertion failure in fifo8_push_all() through am53c974) has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.
=== OUTPUT END ===

Test command exited with code: 1


The full log is available at
http://patchew.org/logs/[e-mail]/testing.checkpatch/?type=message.
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Patch

diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index 507ab363bc..0a26ee1dfd 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -573,6 +573,7 @@  static void esp_do_dma(ESPState *s)
         cmdlen = fifo8_num_used(&s->cmdfifo);
         trace_esp_do_dma(cmdlen, len);
         if (s->dma_memory_read) {
+            len = MIN(len, fifo8_num_free(&s->cmdfifo));
             s->dma_memory_read(s->dma_opaque, buf, len);
             fifo8_push_all(&s->cmdfifo, buf, len);
         } else {