linux-kernel - [PATCH v1 1/1] Revert "thunderbolt: Prevent crash if non-active NVMem file is read"

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Date:   Tue, 14 Apr 2020 02:04:25 +0800
From:   Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
To:     linux-kernel@...r.kernel.org
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
Subject: [PATCH v1 1/1] Revert "thunderbolt: Prevent crash if non-active
 NVMem file is read"

This reverts commit 03cd45d2e219301880cabc357e3cf478a500080f.

Commit 664f0549380c ("nvmem: core: use is_bin_visible for permissions")
incidentally adds support for write-only nvmem. Hence, this workaround
is no longer required, so drop it.

Signed-off-by: Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
---
 drivers/thunderbolt/switch.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index a2ce99051..1ba4050f6 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -348,12 +348,6 @@ static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val,
 	return ret;
 }
 
-static int tb_switch_nvm_no_read(void *priv, unsigned int offset, void *val,
-				 size_t bytes)
-{
-	return -EPERM;
-}
-
 static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
 			       size_t bytes)
 {
@@ -399,7 +393,6 @@ static struct nvmem_device *register_nvmem(struct tb_switch *sw, int id,
 		config.read_only = true;
 	} else {
 		config.name = "nvm_non_active";
-		config.reg_read = tb_switch_nvm_no_read;
 		config.reg_write = tb_switch_nvm_write;
 		config.root_only = true;
 	}
-- 
2.26.0