linux-kernel - [PATCH v2 1/3] mcb: Return actual parsed size when reading chameleon table

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Message-ID: <20230328143441.78932-2-josejavier.rodriguez@duagon.com>
Date:   Tue, 28 Mar 2023 14:34:58 +0000
From:   Rodríguez Barbarin, José Javier 
        <JoseJavier.Rodriguez@...gon.com>
To:     "morbidrsa@...il.com" <morbidrsa@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "jth@...nel.org" <jth@...nel.org>,
        Sanjuán García, Jorge 
        <Jorge.SanjuanGarcia@...gon.com>,
        Rodríguez Barbarin, José Javier 
        <JoseJavier.Rodriguez@...gon.com>
Subject: [PATCH v2 1/3] mcb: Return actual parsed size when reading chameleon
 table

Function chameleon_parse_cells() returns the number of cells parsed
which has an undetermined size. This return value is only used for
error checking but the number of cells is never used.

Change return value to be number of bytes parsed to allow for memory
management improvements.

Co-developed-by: Jorge Sanjuan Garcia <jorge.sanjuangarcia@...gon.com>
Signed-off-by: Jorge Sanjuan Garcia <jorge.sanjuangarcia@...gon.com>
Signed-off-by: Javier Rodriguez <josejavier.rodriguez@...gon.com>
---
 drivers/mcb/mcb-parse.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/mcb/mcb-parse.c b/drivers/mcb/mcb-parse.c
index aa6938da0db8..5c2746e1d4cf 100644
--- a/drivers/mcb/mcb-parse.c
+++ b/drivers/mcb/mcb-parse.c
@@ -130,7 +130,7 @@ static void chameleon_parse_bar(void __iomem *base,
 	}
 }
 
-static int chameleon_get_bar(char __iomem **base, phys_addr_t mapbase,
+static int chameleon_get_bar(void __iomem **base, phys_addr_t mapbase,
 			     struct chameleon_bar **cb)
 {
 	struct chameleon_bar *c;
@@ -179,12 +179,13 @@ int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
 {
 	struct chameleon_fpga_header *header;
 	struct chameleon_bar *cb;
-	char __iomem *p = base;
+	void __iomem *p = base;
 	int num_cells = 0;
 	uint32_t dtype;
 	int bar_count;
 	int ret;
 	u32 hsize;
+	u32 table_size;
 
 	hsize = sizeof(struct chameleon_fpga_header);
 
@@ -239,12 +240,15 @@ int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
 		num_cells++;
 	}
 
+
 	if (num_cells == 0)
 		num_cells = -EINVAL;
 
+	table_size = p - base;
+	pr_debug("%d cell(s) found. Chameleon table size: 0x%04x bytes\n", num_cells, table_size);
 	kfree(cb);
 	kfree(header);
-	return num_cells;
+	return table_size;
 
 free_bar:
 	kfree(cb);
-- 
2.34.1