Subject: linux-next: boot failure after merge of the dma-mapping tree

From: Stephen Rothwell <[email-masked]>
Date: Wed, 9 Jul 2025 23:39:53 +1000

Hi all,

After merging the dma-mapping tree, today's linux-next qemu boot test
(powerpc pseries_le_defconfig) failed like this:

[    0.219439][    T1] ibmvscsi 71000003: SRP_VERSION: 16.a
[    0.219472][    T1] ibmvscsi 71000003: Error -4 opening adapter
[    0.219507][    T1] ibmvscsi 71000003: couldn't initialize crq. rc=-1
[    0.221963][    T1] ibmvscsi 71000003: probe with driver ibmvscsi failed with error -1

The normal output is:

[    0.221208][    T1] ibmvscsi 71000003: SRP_VERSION: 16.a
[    0.221272][    T1] ibmvscsi 71000003: Maximum ID: 64 Maximum LUN: 32 Maximum Channel: 3
[    0.221310][    T1] scsi host0: IBM POWER Virtual SCSI Adapter 1.5.9
[    0.221653][    C0] ibmvscsi 71000003: partner initialization complete
[    0.221696][    C0] ibmvscsi 71000003: host srp version: 16.a, host partition qemu (0), OS 2, max io 2097152
[    0.221752][    C0] ibmvscsi 71000003: sent SRP login
[    0.221778][    C0] ibmvscsi 71000003: SRP_LOGIN succeeded
[    0.223269][    T1] scsi 0:0:2:0: CD-ROM            QEMU     QEMU CD-ROM      2.5+ PQ: 0 ANSI: 5
[    0.239389][   T28] Freeing initrd memory: 1844K
[    0.302192][    C0] sr 0:0:2:0: Power-on or device reset occurred
[    0.302411][    T1] sr 0:0:2:0: [sr0] scsi3-mmc drive: 16x/50x cd/rw xa/form2 cdda tray
[    0.302450][    T1] cdrom: Uniform CD-ROM driver Revision: 3.20
[    0.302800][    T1] sr 0:0:2:0: Attached scsi generic sg0 type 5

Bisectd to commit

  ec7352735abf ("dma-mapping: export new dma_*map_phys() interface")

And reverting that commit, and the following one, in today's linux-next
release, fixes the problem.

-- 
Cheers,
Stephen Rothwell