This is a note to let you know that I've just added the patch titled
s390/pci: fix misleading rc in clp_set_pci_fn()
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-pci-fix-misleading-rc-in-clp_set_pci_fn.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1678f2f69f4e24505f33c30e6843003942eca1cd
Author: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
Date: Wed Jul 21 19:58:54 2021 +0200
s390/pci: fix misleading rc in clp_set_pci_fn()
[ Upstream commit f7addcdd527a6dddfebe20c358b87bdb95624612 ]
Currently clp_set_pci_fn() always returns 0 as long as the CLP request
itself succeeds even if the operation itself returns a response code
other than CLP_RC_OK or CLP_RC_SETPCIFN_ALRDY. This is highly misleading
because calling code assumes that a zero rc means that the operation was
successful.
Fix this by returning the response code or cc on failure with the
exception of the special handling for CLP_RC_SETPCIFN_ALRDY. Also let's
not assume that the returned function handle for CLP_RC_SETPCIFN_ALRDY
is 0, we don't need it anyway.
Reviewed-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
Signed-off-by: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 8fcb7ecb7225..77cd965cffef 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -661,9 +661,10 @@ int zpci_enable_device(struct zpci_dev *zdev)
{
int rc;
- rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
- if (rc)
+ if (clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES)) {
+ rc = -EIO;
goto out;
+ }
rc = zpci_dma_init_device(zdev);
if (rc)
@@ -684,7 +685,7 @@ int zpci_disable_device(struct zpci_dev *zdev)
* The zPCI function may already be disabled by the platform, this is
* detected in clp_disable_fh() which becomes a no-op.
*/
- return clp_disable_fh(zdev);
+ return clp_disable_fh(zdev) ? -EIO : 0;
}
/**
diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index d3331596ddbe..0a0e8b8293be 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -213,15 +213,19 @@ out:
}
static int clp_refresh_fh(u32 fid);
-/*
- * Enable/Disable a given PCI function and update its function handle if
- * necessary
+/**
+ * clp_set_pci_fn() - Execute a command on a PCI function
+ * @zdev: Function that will be affected
+ * @nr_dma_as: DMA address space number
+ * @command: The command code to execute
+ *
+ * Returns: 0 on success, < 0 for Linux errors (e.g. -ENOMEM), and
+ * > 0 for non-success platform responses
*/
static int clp_set_pci_fn(struct zpci_dev *zdev, u8 nr_dma_as, u8 command)
{
struct clp_req_rsp_set_pci *rrb;
int rc, retries = 100;
- u32 fid = zdev->fid;
rrb = clp_alloc_block(GFP_KERNEL);
if (!rrb)
@@ -245,17 +249,16 @@ static int clp_set_pci_fn(struct zpci_dev *zdev, u8 nr_dma_as, u8 command)
}
} while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
- if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
- zpci_err("Set PCI FN:\n");
- zpci_err_clp(rrb->response.hdr.rsp, rc);
- }
-
if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
zdev->fh = rrb->response.fh;
- } else if (!rc && rrb->response.hdr.rsp == CLP_RC_SETPCIFN_ALRDY &&
- rrb->response.fh == 0) {
+ } else if (!rc && rrb->response.hdr.rsp == CLP_RC_SETPCIFN_ALRDY) {
/* Function is already in desired state - update handle */
- rc = clp_refresh_fh(fid);
+ rc = clp_refresh_fh(zdev->fid);
+ } else {
+ zpci_err("Set PCI FN:\n");
+ zpci_err_clp(rrb->response.hdr.rsp, rc);
+ if (!rc)
+ rc = rrb->response.hdr.rsp;
}
clp_free_block(rrb);
return rc;
@@ -301,17 +304,13 @@ int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
- if (rc)
- goto out;
-
- if (zpci_use_mio(zdev)) {
+ if (!rc && zpci_use_mio(zdev)) {
rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_MIO);
zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n",
zdev->fid, zdev->fh, rc);
if (rc)
clp_disable_fh(zdev);
}
-out:
return rc;
}
