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Miller" , Michael Karcher , sparclinux@vger.kernel.org, John Paul Adrian Glaubitz Subject: [PATCH] Revert "sunvdc: Do not spin in an infinite loop when vio_ldc_send() returns EAGAIN" Date: Mon, 6 Oct 2025 11:58:27 +0200 Message-ID: <20251006095827.3666-1-glaubitz@physik.fu-berlin.de> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Original-Sender: glaubitz@physik.fu-berlin.de X-ZEDAT-Hint: PO Content-Type: text/plain; charset="utf-8" In a11f6ca9aef9 ("sunvdc: Do not spin in an infinite loop when vio_ldc_send= () returns EAGAIN"), a maximum retry count was added to __vdc_tx_trigger(). After this change, several users reported disk I/O errors when running Linux inside a logical domain on Solaris 11.4: [19095.192532] sunvdc: vdc_tx_trigger() failure, err=3D-11 [19095.192605] I/O error, dev vdiskc, sector 368208928 op 0x1:(WRITE) flags= 0x1000 phys_seg 2 prio class 2 [19095.205681] XFS (vdiskc1): metadata I/O error in "xfs_buf_ioend+0x28c/0x= 600 [xfs]" at daddr 0x15f26420 len 32 error 5 [19432.043471] sunvdc: vdc_tx_trigger() failure, err=3D-11 [19432.043529] I/O error, dev vdiskc, sector 3732568 op 0x1:(WRITE) flags 0= x1000 phys_seg 1 prio class 2 [19432.058821] sunvdc: vdc_tx_trigger() failure, err=3D-11 [19432.058843] I/O error, dev vdiskc, sector 3736256 op 0x1:(WRITE) flags 0= x1000 phys_seg 4 prio class 2 [19432.074109] sunvdc: vdc_tx_trigger() failure, err=3D-11 [19432.074128] I/O error, dev vdiskc, sector 3736512 op 0x1:(WRITE) flags 0= x1000 phys_seg 4 prio class 2 [19432.089425] sunvdc: vdc_tx_trigger() failure, err=3D-11 [19432.089443] I/O error, dev vdiskc, sector 3737024 op 0x1:(WRITE) flags 0= x1000 phys_seg 1 prio class 2 [19432.100964] XFS (vdiskc1): metadata I/O error in "xfs_buf_ioend+0x28c/0x= 600 [xfs]" at daddr 0x38ec58 len 8 error 5 Since this change seems to have only been justified by reading the code whi= ch becomes evident by the reference to adddc32d6fde ("sunvnet: Do not spin in = an infinite loop when vio_ldc_send() returns EAGAIN") in the commit message, it can be safely assumed the change was neither properly tested nor motivated = by actual bug reports. Thus, let's revert this change to address the disk I/O errors above. Signed-off-by: John Paul Adrian Glaubitz --- drivers/block/sunvdc.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c index db1fe9772a4d..a2aaa4cca676 100644 --- a/drivers/block/sunvdc.c +++ b/drivers/block/sunvdc.c @@ -45,8 +45,6 @@ MODULE_VERSION(DRV_MODULE_VERSION); #define WAITING_FOR_GEN_CMD 0x04 #define WAITING_FOR_ANY -1 =20 -#define VDC_MAX_RETRIES 10 - static struct workqueue_struct *sunvdc_wq; =20 struct vdc_req_entry { @@ -436,7 +434,6 @@ static int __vdc_tx_trigger(struct vdc_port *port) .end_idx =3D dr->prod, }; int err, delay; - int retries =3D 0; =20 hdr.seq =3D dr->snd_nxt; delay =3D 1; @@ -449,8 +446,6 @@ static int __vdc_tx_trigger(struct vdc_port *port) udelay(delay); if ((delay <<=3D 1) > 128) delay =3D 128; - if (retries++ > VDC_MAX_RETRIES) - break; } while (err =3D=3D -EAGAIN); =20 if (err =3D=3D -ENOTCONN) --=20 2.47.3