linux-kernel - [PATCH 5.15 33/72] EDAC/i10nm: Release mdev/mbase when failing to detect HBM

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Date:   Mon, 10 Jan 2022 08:23:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Qiuxu Zhuo <qiuxu.zhuo@...el.com>,
        Tony Luck <tony.luck@...el.com>
Subject: [PATCH 5.15 33/72] EDAC/i10nm: Release mdev/mbase when failing to detect HBM

From: Qiuxu Zhuo <qiuxu.zhuo@...el.com>

commit c370baa328022cbd46c59c821d1b467a97f047be upstream.

On systems without HBM (High Bandwidth Memory) mdev/mbase are not
released/unmapped.

Add the code to release mdev/mbase when failing to detect HBM.

[Tony: re-word commit message]

Cc: <stable@...r.kernel.org>
Fixes: c945088384d0 ("EDAC/i10nm: Add support for high bandwidth memory")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
Signed-off-by: Tony Luck <tony.luck@...el.com>
Link: https://lore.kernel.org/r/20211224091126.1246-1-qiuxu.zhuo@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/edac/i10nm_base.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/edac/i10nm_base.c
+++ b/drivers/edac/i10nm_base.c
@@ -358,6 +358,9 @@ static int i10nm_get_hbm_munits(void)
 
 			mbase = ioremap(base + off, I10NM_HBM_IMC_MMIO_SIZE);
 			if (!mbase) {
+				pci_dev_put(d->imc[lmc].mdev);
+				d->imc[lmc].mdev = NULL;
+
 				i10nm_printk(KERN_ERR, "Failed to ioremap for hbm mc 0x%llx\n",
 					     base + off);
 				return -ENOMEM;
@@ -368,6 +371,12 @@ static int i10nm_get_hbm_munits(void)
 
 			mcmtr = I10NM_GET_MCMTR(&d->imc[lmc], 0);
 			if (!I10NM_IS_HBM_IMC(mcmtr)) {
+				iounmap(d->imc[lmc].mbase);
+				d->imc[lmc].mbase = NULL;
+				d->imc[lmc].hbm_mc = false;
+				pci_dev_put(d->imc[lmc].mdev);
+				d->imc[lmc].mdev = NULL;
+
 				i10nm_printk(KERN_ERR, "This isn't an hbm mc!\n");
 				return -ENODEV;
 			}