linux-kernel - [BUG] scsi: sym53c8xx_2: warning in ___free_dma_mem

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Date:   Tue, 8 Mar 2022 20:17:38 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     willy@...radead.org, jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] scsi: sym53c8xx_2: warning in ___free_dma_mem_cluster()

Hi,

I found a bug when proing the sym53c8xx driver.

When the initialization process fails on sym_find_frimware(), the
driver frees the related resources, which cause a warning in kernel.

The following log reveals it:

[    3.736968] WARNING: CPU: 6 PID: 1 at kernel/dma/mapping.c:528
dma_free_attrs+0xf1/0x110
[    3.737503] Modules linked in:
[    3.737503] CPU: 6 PID: 1 Comm: swapper/0 Not tainted 5.16.0-rc1+ #31
[    3.737503] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009),
BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
[    3.737503] RIP: 0010:dma_free_attrs+0xf1/0x110
[    3.737503] Call Trace:
[    3.737503]  <TASK>
[    3.737503]  ___free_dma_mem_cluster+0x18e/0x6a0
[    3.737503]  __sym_mfree_dma+0x2ec/0x740
[    3.737503]  sym_hcb_free+0x147/0x6e0
[    3.737503]  sym_attach+0xec1/0x1380
[    3.737503]  sym2_probe+0x852/0xab0
[    3.737503]  ? sym_log_bus_error+0x140/0x140
[    3.737503]  local_pci_probe+0x13f/0x210
[    3.737503]  pci_device_probe+0x34c/0x6d0
[    3.737503]  ? pci_uevent+0x470/0x470
[    3.737503]  really_probe+0x24c/0x8d0
[    3.737503]  __driver_probe_device+0x1b3/0x280
[    3.737503]  driver_probe_device+0x50/0x380
[    3.737503]  __driver_attach+0x416/0x580
[    3.737503]  ? driver_attach+0x40/0x40
[    3.737503]  bus_for_each_dev+0x10d/0x160
[    3.737503]  bus_add_driver+0x2f7/0x520
[    3.737503]  driver_register+0x2e9/0x3e0
[    3.737503]  sym2_init+0x16a/0x1fa
[    3.737503]  ? pqi_init+0x174/0x174
[    3.737503]  do_one_initcall+0x10c/0x260
[    3.737503]  ? pqi_init+0x174/0x174
[    3.737503]  ? do_initcall_level+0x133/0x133
[    3.737503]  ? parse_args+0x19e/0x940
[    3.737503]  ? lock_is_held_type+0xe2/0x140
[    3.737503]  do_initcall_level+0x103/0x133
[    3.737503]  do_initcalls+0x46/0x76
[    3.737503]  kernel_init_freeable+0x292/0x396
[    3.737503]  ? rest_init+0x240/0x240
[    3.737503]  kernel_init+0x14/0x1b0
[    3.737503]  ? rest_init+0x240/0x240
[    3.737503]  ret_from_fork+0x22/0x30

Regards,
Zheyu Ma