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x86/EISA: Dereference memory directly instead of using readl()

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Sparse expect an __iomem pointer, but after converting the EISA probe to
memremap() the pointer is a regular memory pointer. Access it directly
instead.

[ tglx: Converted it to fix the already applied version  ]

Fixes: 80a4da0564 ("x86/EISA: Use memremap() to probe for the EISA BIOS signature")
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/alpine.DEB.2.21.2408261015270.30766@angie.orcam.me.uk
This commit is contained in:
Maciej W. Rozycki 2024-08-26 10:21:47 +01:00 committed by Thomas Gleixner
parent cc5e03f3be
commit a678164aad
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kernel/eisa.c
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@ -11,13 +11,13 @@
static __init int eisa_bus_probe(void)
{
void *p;
u32 *p;
if ((xen_pv_domain() && !xen_initial_domain()) || cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
return 0;
p = memremap(0x0FFFD9, 4, MEMREMAP_WB);
if (p && readl(p) == 'E' + ('I' << 8) + ('S' << 16) + ('A' << 24))
if (p && *p == 'E' + ('I' << 8) + ('S' << 16) + ('A' << 24))
EISA_bus = 1;
memunmap(p);
return 0;